Hi Nic - Yes, it seems as though we answered a small portion of our question. However; we are still trying to determine how all of the issues were deleted. My colleague only deleted issues that were reported by him using, the "Reported by Me" filter, and only deleted issues in one project named Upload Test (UT). All of our issues in all projects created by everyone were deleted.

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Ok. Is it just the issues, or have the projects gone too?
That should establish the method of deletion, but I suspect someone used bulk-edit to delete the wrong set of issues.
(In the long term, you should remove delete permission from most of your users)

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Ok, it was definitely a filter then. I'm not sure how to replicate what they did directly, but my guess would be that they accidentally cleared the filter before running the delete (it changed from "reported by me" to "everything")

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